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What is flags in the linux driver?

Source: Internet
Author: User
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What is flags in the linux driver? -- Linux general technology-Linux technology and application information. For details, refer to the following section. Linux driver programming has the following section:

Unsigned long flags;
Save_flags (flags );
Cli ();
/* Critical code */
Restore_flags (flags );

The purpose is to prevent other interruptions.

My question is: what is the value of flags? After a variable is defined, it is used immediately without a value assignment. I don't know how he can shut down the interrupt?

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